Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2000-10-14
Physics
High Energy Physics
High Energy Physics - Experiment
6 pages, Latex, 2 figures(eps), Talk at Intern. Conference on the Structure and Interactions of the Photon: Incl. the 13 Inter
Scientific paper
10.1063/1.1402865
High energy photon colliders (gamma-gamma, gamma-electron) based on backward Compton scattering of laser light is a very natural addition to e+e- linear colliders. In this report we consider mainly this option for the TESLA project. Recent study has shown that the horizontal emittance in the TESLA damping ring can be further decreased by a factor of four. In this case the gamma-gamma luminosity luminosity in the high energy part of spectrum can reach 0.3--0.5 L_e+e-. Typical cross sections of interesting processes in gamma-gamma collisions are higher than those in e+e- collisions by about one order of magnitude, so the number of events in gamma-gamma collisions will be more that in e+e- collisions. The key new element in photon colliders is a very powerful laser system. The most straightforward solution is ``an optical storage ring (optical trap)'' with diode pumped laser injector which is today technically feasible. This paper briefly review the status of a photon collider based at TESLA, its possible parameters.
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